System Manual HS3A-H21M4
3
Correct Use
The non contact safety switch series HS3A are interlocking devices without
guard locking (Type 4). HS3A complies with the requirements according to
EN IEC 60947-5-3. Devices with unicode evaluation (HS3A-H21U4) pos-
sess a high coding level; devices with multicode evaluation (HS3A-H21M4)
feature a low coding level.
In combination with a movable safety guard and the machine control, this
safety component prevents dangerous machine functions from occurring
while the safety guard is open. A stop command is triggered if the safety
guard is opened during the dangerous machine function.
This means:
Starting commands that cause a dangerous machine function must be-
come active only when the safety guard is closed.
Opening the safety guard triggers a stop command.
Closing a safety guard must not cause automatic starting of a dangerous
machine function. A separate start command must be issued. For excep-
tions, refer to EN ISO 12100 or relevant C-standards.
Before HS3A is used, a risk assessment must be performed on the machine,
e. g., in accordance with:
EN ISO 13849-1, Safety of machinery – Safety related parts of control
systems – Part 1: General principles for design
EN ISO 12100, Safety of machinery – General principles for design –
Risk assessment and risk reduction
IEC 62061, Safety of machinery – Functional safety of safety-related
electrical, electronic and programmable electronic control systems
Correct use includes observing the relevant requirements for installation and
operation, particularly based on the following standard:
EN ISO 13849-1, Safety of machinery – Safety related parts of control
systems – Part 1: General principles for design
EN ISO14119, Safety of machinery – Interlocking devices associated with
guards – Principles for design and selection
EN 60204-1, Safety of machinery – Electrical equipment of machines –
Part 1: General requirements
HS3A is only allowed to be operated in conjunction with the intended HS9Z
actuators from IDEC and the related connection components from IDEC. On
the use of different actuators or other connection components, IDEC pro-
vides no warranty for safe function.
Several devices are only allowed to be connected in series using devices
intended for series connection with the HS3A. Please check this in the op-
erating instructions of the respective device. A combination of devices from
other manufacturers is not allowed.
A maximum of 20 safety switches are allowed to be operated in a switch
chain.
